/**
 *
 * Copyright 2018 iQIYI.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package com.iqiyi.halberd.liteapp.exo;

import android.content.Context;
import android.support.annotation.IntDef;
import android.util.AttributeSet;
import android.view.View;
import android.widget.FrameLayout;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

/**
 * Created by eggizhang@qiyi.com on 17-12-5.
 * using this layout play video
 */
public class AspectRatioFrameLayout extends FrameLayout{
    /**
     * Resize modes for {@link AspectRatioFrameLayout}.
     */
    @Retention(RetentionPolicy.SOURCE)
    @IntDef({RESIZE_MODE_FIT, RESIZE_MODE_FIXED_WIDTH, RESIZE_MODE_FIXED_HEIGHT, RESIZE_MODE_FILL,
            RESIZE_MODE_ZOOM})
    public @interface ResizeMode {}

    /**
     * Either the width or height is decreased to obtain the desired aspect ratio.
     */
    public static final int RESIZE_MODE_FIT = 0;
    /**
     * The width is fixed and the height is increased or decreased to obtain the desired aspect ratio.
     */
    public static final int RESIZE_MODE_FIXED_WIDTH = 1;
    /**
     * The height is fixed and the width is increased or decreased to obtain the desired aspect ratio.
     */
    public static final int RESIZE_MODE_FIXED_HEIGHT = 2;
    /**
     * The specified aspect ratio is ignored.
     */
    public static final int RESIZE_MODE_FILL = 3;
    /**
     * Either the width or height is increased to obtain the desired aspect ratio.
     */
    public static final int RESIZE_MODE_ZOOM = 4;

    /**
     * The {@link FrameLayout} will not resize itself if the fractional difference between its natural
     * aspect ratio and the requested aspect ratio falls below this threshold.
     * <p>
     * This tolerance allows the view to occupy the whole of the screen when the requested aspect
     * ratio is very close, but not exactly equal to, the aspect ratio of the screen. This may reduce
     * the number of view layers that need to be composited by the underlying system, which can help
     * to reduce power consumption.
     */
    private static final float MAX_ASPECT_RATIO_DEFORMATION_FRACTION = 0.01f;

    private float videoAspectRatio;
    private int resizeMode;

    public AspectRatioFrameLayout(Context context) {
        this(context, null);
    }

    public AspectRatioFrameLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        resizeMode = RESIZE_MODE_FIT;
        if (attrs != null) {
//            TypedArray a = context.getTheme().obtainStyledAttributes(attrs,
//                    com.google.android.exoplayer2.ui.R.styleable.AspectRatioFrameLayout, 0, 0);
//            try {
//                resizeMode = a.getInt(com.google.android.exoplayer2.ui.R.styleable.AspectRatioFrameLayout_resize_mode, RESIZE_MODE_FIT);
//            } finally {
//                a.recycle();
//            }
        }
    }

    /**
     * Sets the aspect ratio that this view should satisfy.
     *
     * @param widthHeightRatio The width to height ratio.
     */
    public void setAspectRatio(float widthHeightRatio) {
        if (this.videoAspectRatio != widthHeightRatio) {
            this.videoAspectRatio = widthHeightRatio;
            requestLayout();
        }
    }

    /**
     * Returns the resize mode.
     */
    public @AspectRatioFrameLayout.ResizeMode
    int getResizeMode() {
        return resizeMode;
    }

    /**
     * Sets the resize mode.
     *
     * @param resizeMode The resize mode.
     */
    public void setResizeMode(@AspectRatioFrameLayout.ResizeMode int resizeMode) {
        if (this.resizeMode != resizeMode) {
            this.resizeMode = resizeMode;
            requestLayout();
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        if (resizeMode == RESIZE_MODE_FILL || videoAspectRatio <= 0) {
            // Aspect ratio not set.
            return;
        }

        int width = getMeasuredWidth();
        int height = getMeasuredHeight();
        float viewAspectRatio = (float) width / height;
        float aspectDeformation = videoAspectRatio / viewAspectRatio - 1;
        if (Math.abs(aspectDeformation) <= MAX_ASPECT_RATIO_DEFORMATION_FRACTION) {
            // We're within the allowed tolerance.
            return;
        }

        switch (resizeMode) {
            case RESIZE_MODE_FIXED_WIDTH:
                height = (int) (width / videoAspectRatio);
                break;
            case RESIZE_MODE_FIXED_HEIGHT:
                width = (int) (height * videoAspectRatio);
                break;
            case RESIZE_MODE_ZOOM:
                if (aspectDeformation > 0) {
                    width = (int) (height * videoAspectRatio);
                } else {
                    height = (int) (width / videoAspectRatio);
                }
                break;
            default:
                if (aspectDeformation > 0) {
                    height = (int) (width / videoAspectRatio);
                } else {
                    width = (int) (height * videoAspectRatio);
                }
                break;
        }
        super.onMeasure(View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY),
                View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.EXACTLY));
    }

}
